OXYGEN ELECTRODE COMPRISING DUAL PLATING CATALYST, WATER ELECTROLYSIS DEVICE AND REGENERATIVE FUEL CELL COMPRISING THE SAME, AND METHOD FOR PREPARING THE OXYGEN ELECTRODE

• US 20200131657A1
• Filed: 10/02/2019
• Published: 04/30/2020
• Est. Priority Date: 10/26/2018
• Status: Abandoned Application

• Current Assignee: Korea Advanced Institute of Science and Technology
• Original Assignee: Korea Advanced Institute of Science and Technology
• Inventors: PARK, Hyun Seo, JANG, Jong Hyun, PARK, Hee-Young, KIM, Jin Young, LEE, So Young, YOO, Sung Jong, Henkensmeier, Dirk, KIM, Hyoung-Juhn, LIM, Ahyoun, KIM, Junyoung, LEE, Hye Jin
• Application Number:
  US16/590,857
• Publication Number:
  US 20200131657A1
• Time in Patent Office: Days
• CPC Class Codes: C25B 1/04 by electrolysis of water
• CPC Class Codes: C25B 11/051 Electrodes formed of electrocatalysts on a substrate or carrier
• CPC Class Codes: C25B 11/057 consisting of a single element or compound
• CPC Class Codes: C25B 11/091 consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic compounds
• CPC Class Codes: C25B 9/23 comprising ion-exchange membranes in or on which electrode material is embedded
• CPC Class Codes: C25D 3/50 of platinum group metals
• CPC Class Codes: C25D 9/00 Electrolytic coating other than with metals C25D11/00, C25D15/00 take precedence; electrophoretic coating C25D13/00
• CPC Class Codes: C25D 9/08 by cathodic processes
• CPC Class Codes: H01M 2004/8689 Positive electrodes
• CPC Class Codes: H01M 4/8657 layered
• CPC Class Codes: H01M 4/9016 Oxides, hydroxides or oxygenated metallic salts
• CPC Class Codes: H01M 4/925 supported on carriers, e.g. powder carriers
• CPC Class Codes: H01M 8/18 Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
• CPC Class Codes: Y02E 60/36 Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
• CPC Class Codes: Y02E 60/50 Fuel cells

Abstract

The present disclosure relates to an oxygen electrode comprising a dual plating catalyst, a water electrolysis device and a regenerative fuel cell comprising the same, and a method for preparing the oxygen electrode.

Claims

1. An oxygen electrode, comprising:

a substrate;

a platinum (Pt) layer formed on the substrate by electroplating; and

an iridium oxide layer formed on the Pt layer by electroplating.

2. The oxygen electrode of claim 1, wherein the oxygen electrode is for a water electrolysis device.

3. The oxygen electrode of claim 1, wherein the oxygen electrode is for regenerative fuel cells.

4. The oxygen electrode of claim 1, wherein the Pt layer comprises Pt particles adhered to the substrate.

5. The oxygen electrode of claim 1, wherein the iridium oxide layer comprises iridium oxide particles surrounding the Pt layer or Pt particles.

6. The oxygen electrode of claim 1, wherein the Pt layer has a weight of 0.05 mg/cm² to 0.7 mg/cm².

7. The oxygen electrode of claim 1, wherein the Pt layer and iridium oxide layer have a total weight of 0.1 mg/cm² to 1.0 mg/cm².

8. The oxygen electrode of claim 1, wherein the substrate is a titanium paper composed of titanium fibers.

9. The oxygen electrode of claim 1, wherein the oxygen electrode is used for a regenerative fuel cell operated at a current density of 0.1 A/cm².

10. A water electrolysis device comprising the oxygen electrode according to claim 1.

11. A regenerative fuel cell comprising the oxygen electrode according to claim 1.

12. The regenerative fuel cell of claim 11, wherein the regenerative fuel cell is a unitized regenerative fuel cell (URFC).

13. A method for preparing the oxygen electrode according to claim 1, comprising:

forming a platinum (Pt) layer on a substrate by electroplating; and

forming an iridium oxide layer on the Pt layer by electroplating.

14. The method for preparing the oxygen electrode of claim 13, wherein forming a Pt layer on the substrate by electroplating involves controlling at least one of a plating current and a plating time.

15. The method for preparing the oxygen electrode of claim 14, wherein the plating current is −

100 mA cm′

to −

5 A cm<sup>−

2</sup>.

16. The method for preparing the oxygen electrode of claim 14, wherein the plating time is 30 seconds to 10 minutes.